Biscuit extends the YARD parser generator by binding with the Boost finite state machine library. Biscuit was developed with the intention of using it to build a lightweight and efficient XML parser. According to mb2sync the YARD parser produced much smaller parsers than the Boost Spirit parsing library, and it did so much more quickly. I maintain that YARD is also more efficient at run-time than Spirit, but I only have performed a few experiements to verify this. Besides, being the original authour I can not be trusted to be unbiased.

I am watching the Biscuit parser project closely, and has a high likely of superceding the YARD parser. I am hoping to use it in the next iteration of the Heron parser, and to aid in its development.